New instances classification framework on Quran ontology applied to question answering system

TELKOMNIKA, Vol.17, No.1, February 2019, pp.139~146
ISSN: 1693-6930, accredited First Grade by Kemenristekdikti, Decree No: 21/E/KPT/2018
DOI: 10.12928/TELKOMNIKA.v17i1.9794  139
Received May 4, 2018; Revised October 2, 2018; Accepted October 30, 2018
New instances classification framework on Quran
ontology applied to question answering system
Fandy Setyo Utomo
*1
, Nanna Suryana
2
, Mohd Sanusi Azmi
3
1
Department of Information Systems, STMIK AMIKOM Purwokerto, Purwokerto, Indonesia
1,2,3
Center for Advanced Computing Technology (C-ACT), Fakulti Teknologi Maklumat dan Komunikasi,
Universiti Teknikal Malaysia Melaka, Melaka, Malaysia
*Corresponding author, e-mail: fandy_setyo_utomo@amikompurwokerto.ac.id
Abstract
Instances classification with the small dataset for Quran ontology is the current research problem
which appears in Quran ontology development. The existing classification approach used machine
learning: Backpropagation Neural Network. However, this method has a drawback; if the training set
amount is small, then the classifier accuracy could decline. Unfortunately, Holy Quran has a small corpus.
Based on this problem, our study aims to formulate new instances classification framework for small
training corpus applied to semantic question answering system. As a result, the instances classification
framework consists of several essential components: pre-processing, morphology analysis, semantic
analysis, feature extraction, instances classification with Radial Basis Function Networks algorithm, and
the transformation module. This algorithm is chosen since it robustness to noisy data and has an excellent
achievement to handle small dataset. Furthermore, document processing module on question answering
system is used to access instances classification result in Quran ontology.
Keywords: information retrieval, ontology learning, ontology population, ontology, question answering
system
Copyright © 2019 Universitas Ahmad Dahlan. All rights reserved.
1. Introduction
Quran is the holy book of Muslims which contains the commandment of Allah remarks.
As a holy book, Quran includes rich knowledge, instructions and guidance to humankind in
achieving happiness in life in the world and the hereafter, and also scientific facts. Based on our
previous research toward recent Quran ontology development [1], we have identified several
potential issues with it. Instances classification with the small dataset for Quran ontology is one
of the problems which appear in previous research. The taxonomic relationship is an
association among classes or instances to classes [2, 3]. Previous research by [4-7] performed
instances classification to classify the Quran verses based on their themes or thematic topics in
Holy Quran. In these case, themes have a role as classes and Quran verses as instances in the
ontology. To accomplish instances classification, all of them conducted with the non-automated
process, manually by the human. Manual instance classification by domain experts and
knowledge engineers is an expensive, not trivial, and time-consuming task. A different method
was performed by [8] to implement verses classification. However, they didn't use an ontology to
store the knowledge representation, but with the relational database. They used Surah
Al-Baqarah as a dataset and Backpropagation Neural Network (BPNN) to classify the Quran
verses. Then, they categorise it into three classes, i.e. Fasting, Pilgrimage, and None class.
Each class has 50 Quran verses as a dataset. 80% of the dataset is used as a training set and
the rest as a testing set. Supervised learning such BPNN classifier, commonly necessitate a
large training data to determine a classifier that performs well. The drawback from Supervised
learning, if the training set amount is small, then the classifier accuracy could decline [9-11].
Unfortunately, Holy Quran has a small dataset. It has 114 surah and 6236 verses. Based on this
problem, this research aims to formulate a new framework to perform instances classification on
a small dataset. The purpose of instances classification according to thematic topics of Holy
Quran is to associate the verses with the principal topic to obtain an entire picture of the theme
and for providing an improved comprehension to the users [12, 13]. Moreover, the essential aim
of instances (verses) classification is to decrease the searching space by determining the
passages of information that are suitable for the specific topic [8], [14, 15]. Furthermore, we also

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TELKOMNIKA Vol.17, No.1, February 2019: 139-146
140
introduced question answering framework that consumes the Quran ontology which stores the
result of instances classification. This Quran ontology used to support question answering
system to provide suitable information to the users.
2. Ontology Population Techniques
Ontology population is the methodologies for extracting the instances of concepts from
the Natural Language text in the external source, then adding them to the existing domain
ontology [16-18]. There are several approaches to perform ontology population, i.e.
Lexico-syntactic Patterns, Similarity-based Classification, Supervised learning,
Knowledge-based and Linguistic Approaches [19]. Another technique to perform ontology
population was conducted by [20]. They used Ontology Design Patterns (ODPs) to develop
automated domain ontology bilingual in Indonesian and English in tuberculosis malady.
Supervised approaches such as Support Vector Machine, Naive Bayes, Decision Tree, and
Artificial Neural Network are machine learning algorithms which are used to classify of a
particular instance with a model induced from training data [19], [21]. However, the deficiency
from Supervised learning, if the training set amount is small, then the classifier accuracy could
decline.
3. Question Answering System
Question Answering systems presenting an interface, where users could state their
demand for information in the Natural Language format and the search engine will produce
suitable answers to these questions [22-24]. More specific described by [25], question
answering system is a technology used to find, extract, and provide a proper answer to the
user's query in the natural language format. This system consists of several essential
components, i.e. question processing module, document processing module, and answer
extraction module [24], [26, 27]. There are several QAS approaches based on the method which
is used by the document processing module to retrieve the candidate documents from the data
source, i.e. linguistic, statistical, semantic, and rule-based approach [28]. This study applied the
semantic approach to our question answering framework. Ontology could store the knowledge
representation of Quran. While for providing relevant information to the users, semantic search
approaches able to extract the knowledge of Holy Quran from an ontology.
4. New Instances Classification Framework Applied to Question Answering System
Based on our study through the literature review, analysing the current instances
classification techniques and question answering system, we proposed the new instances
classification framework applied to question answering system as shown in Figure 1. Instances
classification framework is described in Figure 1 on the left side, while question answering
framework on the right side. Both frameworks could be implemented in every language.
However, this study focuses on Tafsir of Indonesian Quran translation as an input in instances
classification framework and Indonesian as an input for question answering framework. Each
language has a different written format, grammar, vocabulary, and syntax [29-31]. Based on this
condition, natural language processing technique applied to perform pre-processing,
morphology analysis, and semantic analysis is different for every languages. This Sub-Section
is organised as follows. Sub-Section 4.1 describes the new instances classification framework,
and sub-section 4.2 presents the question answering framework that consumes the Quran
ontology which stores the result from instances classification.
As shown in Figure 1, instances classification framework consists of two parts, i.e.
construction of training data and classification stage. Description of each part explained in
sub-section 4.1.1 and 4.1.2.
4.1. New Instances Classification Framework
The construction of training data stage purpose is to provide training data that will be
used in classification stage, while classification stage aims to classify the instances based on
thematic topics on Holy Quran.

TELKOMNIKA ISSN: 1693-6930 
New instances classification framework on Quran ontology… (Fandy Setyo Utomo)
141
Figure 1. Instances classification framework applied to question answering framework
4.1.1. Construction of Training Data Stage
Tafsir of the Quran verses is used as input on pre-processing phase. The aim of
automatic pre-processing phase prepares the words with an appropriate form by tokenisation,
disposing the punctuation, and applying stop words removal. The output from the
pre-processing phase is used as the input for the morphology analysis phase. At the
morphology analysis phase, Tafsir of the verses is processed using stemming operation with
stemmer algorithm for Indonesian text from [32] which has been modified. Stemming is an
action to modify the words in a document into root word form with a specific rule [33]. More
specific, stemming is a process to identify and reduce a derivational or inflectional term to its
root form by eliminating all its affixes. We modified stemmer algorithm from [32] since research
by [34] has identified several weaknesses in the algorithm. Furthermore, based on our analysis,
Adriani stemmer also failed to stem words such as “pemimpi” and “terisi” since derivational
suffixes removal are performed first without examining the prefix. Another weakness delivered
directly within [32] study, confix pairs “be-. . . –lah”; “be-. . . –an”; “me- . . . –i”; “di-. . . –i”; “pe-. . .
–i”; and “te-. . . –i” have incorrectly stemming results since suffixes removal is conducted first
before prefixes removal. To solve all the problem that appears, we proposed a modification
to [32] algorithm. The flowchart diagram as shown in Figure 2, define the modification for the
stemmer algorithm.
The output from morphology analysis phase is essential keywords in root word form.
Then, this output is used as input in the next step, semantic analysis. The aim of the semantic
analysis stage to expand the keywords representation on Tafsir of Quran verses since words on
the dataset (main database) might employ another keyword. Moreover, this stage aim also to
minimise and delimit the words representation that appears in the training data. Without
semantic analysis on the keywords, then the data set shall have a large number of features.
This study used Indonesian WordNet from [35] to conduct semantic analysis on the keywords.
Based on verification method and synsets quality, their Indonesian WordNet consists of five
categories, i.e. "Y", "O", "M", "L", and "X". Where "Y" and "O" in high quality, "M" in medium
quality, "L" probably poor quality, and "X" in poor quality. The algorithm in pseudocode as
shown below is used to describe the flow of semantic analysis process for prepare the training
data on the dataset.

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142
string s = text
string[] words = split the text within s variable by whitespace as text
boundary
string[] new_words = null
foreach (string word in words)
string[] lemma = null
if the word not found in the dataset then
if the word found in the Indonesian WordNet then
if the word found with "Y" quality then
string synset_number = get the synset number
lemma = get the lemma based on synset_number variable
end if
if the word found with "O" quality then
string synset_number = get the synset number
lemma = get the lemma based on synset_number variable
end if
lemma = remove duplicate words in the lemma array variable
string string_temp = word
foreach (string term in lemma)
if term found in the dataset then
string_temp = term
break
end if
end foreach
add string_temp into new_words variable
end if
else
add word into new_words variable
end if
else
add word into new_words variable
end foreach
The output from the semantic analysis phase is the new keywords based on the
Indonesian WordNet. This output is used as an input on features extraction and class labelling
stage. On this phase, features that extracted are Surah and verses number, keywords, term
frequency, and class (themes) labelling for each Tafsir of the Quran verses according to
thematic topics on Quran. This labelling manually is conducted by the human. The keywords,
term frequency, and class labelling on each Tafsir are used to create the Term
Frequency-inverse Document Frequency (TF-IDF) model which will be used in the instances
classification stage. All of the features then store in the data set as a training data for
classification stage.
4.1.2. Classification Stage
The test data on classification stage is processed with specific components. These
components are pre-processing, morphology analysis, semantic analysis, feature extraction,
and instances classification with a statistical approach. Tafsir of the verses is used as input on
classification stage. Pre-processing, morphology analysis, semantic analysis, feature extraction
explanation is equal to these components application on the construction of training data phase.
Furthermore, since features extraction phase is finished, thereupon the TF-IDF model is
classified by Radial Basis Function Networks (RBFN) algorithm [36]. This model utilised the
feature extraction data from the previous and current stage. RBFN has specific benefits. There
are hardiness to noisy data [37, 38] and has an excellent achievement to handle small
data set [39, 40]. A study by [41] has shown with the F1 measure that RBFN has better
performance and more consistent than BPNN to perform text classification on small newsgroup
dataset.
The classification results by RBFN then stored in the main database (relational
database). Finally, tools such as DataMaster [42] and OntoBase [43] as a plugin for Protégé
editor is used to convert the relational database into an ontology. This conversion applied
several mapping rules to transform the relational database components such as tables,
columns, tuples, and foreign keys into ontology components such as classes, properties, and

143
instances. Figure 3 shows an example of direct mapping from a relational database into an
ontology.
Figure 2. Stemmer algorithm modification
As shown as in Figure 3, there are one to many relationships between two tables from a
relational database, i.e. thematic index to store the topics/themes in Holy Quran; and verses to
save Quran surah name, verse number, Arabic text of Quran verse, Indonesian translation of
Quran verse, Tafsir of the verse, and themes of the verse. This relationship mapped into a
subclass of the main ontology class, i.e. verses as the subclass and thematic_index as the main
class. Next, all columns except the foreign key in the relational database are mapped into
Datatype Properties. For example, based on Figure 3, thematic_id and thematic_domain_name
as columns on thematic_index would be mapped into an integer (represent the thematic_id) and
string (represent the thematic_domain_name) data type as properties for thematic_index
ontology class. Furthermore, verses classification result which is stored on thematic_id column
will be mapped into ontology as instances of a class.
4.2. Question Answering Framework
As shown in Figure 1, our question answering framework consists of several
components, i.e. pre-processing, morphology analysis, question classification, query expansion,
document processing, and answer extraction. The input for the pre-processing stage is user
queries in a factoid question, "what" question. Furthermore, this query is processed by
pre-processing and morphology analysis phase with the similar technique which utilised on
instances classification stage. The output from morphology analysis phase is essential

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144
keywords in root word form. Moreover, these keywords are used as an input in question
classification stage. This stage aims to extract and determines answer type by performing
question classification with RBFN algorithm. The answer type based on thematic topics which
available on Holy Quran. Training data which utilised to perform question classification is equal
to the data which used in instances classification stage. Furthermore, the keywords from the
morphology analysis stage are used as an input in query expansion phase. This phase aims to
expand the keywords using query expansion technique. This technique applies Indonesian
WordNet [35] to expand the keywords. The output from query expansion stage is the origin
keywords and their synonym. Subsequently, this output is used as an input in document
processing stage. Moreover, the answer type as the output from question classification phase
also used as an input in it.
The document processing stage performed execution of SPARQL query with some
parameters, i.e. the answer type and keywords from the previous phase. This answer type
would access the class of thematic topics within Quran ontology, and the keywords are used to
extract the instances based on the class. This execution generates answers candidate, i.e.
Quran verses and their Tafsir. The output from this phase is used as the input in the answer
extraction stage. Finally, at the answer extraction stage, words matching scoring technique is
applied to rank the verses and their Tafsir. This technique computes the number of similar
words between the expanded query and the Tafsir of the verses, then rank all these verses
score. The best answer is determined based on the verse with the highest score.
Figure 3. Transformation from relational database to ontology
5. Conclusion
This study introduces an instances classification framework on Quran ontology applied
to the semantic question answering system (QAS). The instances classification framework
consists of two stages, i.e. construction of training data and classification stage. There are
several essential components to classify the instances, i.e. pre-processing, morphology
analysis, semantic analysis, features extraction, instances classification with the statistical or
machine learning approach: Radial Basis Function Networks (RBFN), and transformation stage.
RBFN algorithm is chosen since it robustness to noisy data and has an excellent achievement
to handle small dataset. Our proposed framework work for small training corpus like Quran.

145
Furthermore, document processing stage on question answering system is used to access
instances classification result in Quran ontology through SPARQL query execution. This query
contains some parameters, i.e. the answer type from question classification phase and
keywords from morphology analysis phase on QAS. This answer type would access the class of
thematic topics within Quran ontology, and the keywords are used to extract the instances
based on the class. For the next research, we will develop and test the instances classification
framework. Moreover, we also build and test the semantic question answering system which
accesses the Quran ontology. Evaluation against instances classification framework for
measuring and improving the framework performance to classify the instances with small
training corpus. Furthermore, the evaluation of the QAS is performed to measure the QAS
output accuracy for the answer was given to the users.
Acknowledgments
The authors would like to thank the financial support from STMIK AMIKOM Purwokerto;
and Center for Advanced Computing Technology (C-ACT), Fakulti Teknologi Maklumat dan
Komunikasi, Universiti Teknikal Malaysia Melaka (UTeM) for their assistance in this research.
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